<?php

namespace app\common\services\captcha;

/**
 * Class ValidateCode 验证码类
 * Author: yanhaoqiang
 * @package app\common\services\captcha
 */
class ValidateCode {
    private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
    private $code;//验证码
    private $codelen = 4;//验证码长度
    private $width = 100;//宽度
    private $height = 37;//高度
    private $img;//图形资源句柄
    private $font;//指定的字体
    private $fontsize = 28;//指定字体大小
    private $fontcolor;//指定字体颜色

    /**
     * ValidateCode constructor.
     * @param $path
     */
    public function __construct($path) {
        $this->font = $path;//注意字体路径要写对，否则显示不了图片
    }

    /**
     * [createCode 生成随机码]
     * @return void
     */
    private function createCode() {
        $_len = strlen($this->charset) - 1;
        for ($i = 0; $i < $this->codelen; $i++) {
            $this->code .= $this->charset[mt_rand(0, $_len)];
        }
    }

    /**
     * [createBg 生成背景]
     * @return void
     */
    private function createBg() {
        $this->img = imagecreatetruecolor($this->width, $this->height);
        $color = imagecolorallocate($this->img, 255, 255, 255);
        imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
    }

    /**
     * [createFont 生成文字]
     * @return void
     */
    private function createFont() {
        $_x = $this->width / $this->codelen;
        for ($i = 0; $i < $this->codelen; $i++) {
            $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
        }
    }

    /**
     * [createLine 生成线条、雪花]
     * @return void
     */
    private function createLine() {
        //线条
        for ($i = 0; $i < 6; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
        }
        //雪花
        for ($i = 0; $i < 100; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
            imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color);
        }
    }

    /**
     * [outPut 输出]
     * @return void
     */
    private function outPut() {
        header('Content-type:image/png');
        imagepng($this->img);
        imagedestroy($this->img);
    }

    /**
     * [doimg 对外生成]
     * @return void
     */
    public function doimg() {
        $this->createBg();
        $this->createCode();
        //$this->createLine();
        $this->createFont();
        $this->outPut();
    }

    /**
     * [getCode 获取验证码]
     * @return string
     */
    public function getCode() {
        return strtolower($this->code);
    }
}
